chore: delete useless files

.gitpod.yml

@@ -1,8 +0,0 @@
-tasks:
-  - command: gp await-port 3000 && gp preview $(gp url 3000)/tech-interview-handbook/
-  - before: cd website/
-    init: yarn install
-    command: yarn start
-ports:
-  - port: 3000
-    onOpen: ignore

design/README.md

@@ -1,5 +0,0 @@
-# System Design
-
-[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/system-design/).
-
-<!-- TODO: Remove in future -->

node_modules/.yarn-integrity

@@ -1,12 +0,0 @@
-{
-  "systemParams": "darwin-arm64-93",
-  "modulesFolders": [
-    "node_modules"
-  ],
-  "flags": [],
-  "linkedModules": [],
-  "topLevelPatterns": [],
-  "lockfileEntries": {},
-  "files": [],
-  "artifacts": {}
-}

preparing/README.md

@@ -1,5 +0,0 @@
-# Preparing
-
-[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/coding-interview-prep/).
-
-<!-- TODO: Remove in future -->

preparing/cheatsheet.md

@@ -1,5 +0,0 @@
-# Cheatsheet
-
-[Contents have been moved to the website. Click here.](https://www.techinterviewhandbook.org/coding-interview-cheatsheet/).
-
-<!-- TODO: Remove in future -->